Make bright the arrows - This is the prophet's address to Babylon.
The Lord hath raised up the spirit of the kings of the Medes - Of Cyaxares king of Media, called Darius the Mede in Scripture; and of Cyrus king of Persia, presumptive heir of the throne of Cyaxares, his uncle. Cambyses, his father, sent him, Cyrus, with 30, 000 men to assist his uncle Cyaxares, against Neriglissar king of Babylon, and by these was Babylon overthrown.
Make bright - Rather, Sharpen.
The Medes Genesis 10:2 were a branch of the great Aryan family, who as conquerors had seized upon the vast regions extending from the Caspian Sea to the eastern borders of Mesopotamia, but without being able to dispossess the Turanian tribes who had previously dwelt there. They were divided into numerous clans, each with its own local chief, the leaders of the larger sections being those who are here called kings.